Paper cone and art of making same



March 23 1926. 1,577,979

P. LE R. MCCALL.

PAPER CONE AND ART OF MAKING SAME Filed 0 t. 17, 1925 edge on the inside might be done at points Patented Mar. 23, 71926.

UNITED STATES PETER LE BOY MCGALL, OF BOGKINGHAM, NORTH CAROLINA.

PAPER CONE AND ART OF MAKING SAME.

Application filed October 17, 1925. Serial No. 63,096.

cones, it has heretofore employ a rotary conical mandrel, such mandrel having a longitudinal slot in its surface, into which slot one edge of the sector-shaped blank is inserted, so that, as the mandrel is turned, the blank, having been previously coated with adhesive, is wound upon the mandrel to form a cone.

Before such a cone is marketable, the ends must be trimmed off, on true transverse planes, to provide a neat, smoothly finished article, and in order that such trimming operation might be performed while the cone was still on the mandrel, it has been proposed to make the edge which is held in the slot of the mandrel somewhat shorter than the body of the cone, so that the trimming beyond the ends of such edge or tongue. (See Smith Patent No. 886,884, dated May 5, 1908.)

This method, however, proved undesirable, for the reason that, in the finished cone, the edge or tongue referred to, which lies on the inside of the cone, did not extend the full length of the cone, but terminated short of the base thereof. This produced a thin spot, which not only weakened the structure, but resulted in a cone which was slightly unbalanced. and which therefore tended to vibrate when rotated at high speeds.

It has also been proposed to manufacture cones from blanks having a deckle or feather of the cone, for the purpose of giving a well balanced uniform cone with an exceptionall smooth interior. \Vhile this method is highly desirable, from a theoretical standpoint, it has been found objectionable in practice. owing to the great difficulty ofproperly gripping and holding such a feather edge on the mandrel, and the impossibility of preventing such an edge from frequently becoming curled, puckered, torn or otherwise distorted, thus producing irregularities and resulting in many defective cones.

The present invention seeks to provide a cone having all of the advantages of that resulting from the deckle edge method, but with none of the defects of such method, and to this end I propose to construct a cone from a blank'having the edge which lies inside of the cone consisting partly of a deckle or feather edge, and partly of an edge of substantial thickness.

In this way, the deckle edge portion serves to form a smooth and practically invisible joint or seam near the base of the cone,

where smoothness is required, while, at the same time, the thicker portion constitutes a tongue which can befirmly engaged in the usual slot of the winding mandrel, the same as in the Smith patent above referred to, and the necessity for attempting to grip or hold the blank by a feather edge, with all its attendant dilficulties is thus obviated.

In order that the invention may be readily understood, reference is had to the accompanying drawing, forming part of this specification, and in which Figure 1 is a diagrammatic perspective view showing the method in which my improved blank is placed upon the forming mandrel;

Figure 2 is a view of the blank itself;

Figure 3 is a central vertical section through a finished cone, showing the inside joint; and

Figures 4 and 5 are horizontal transverse sections substantially on the lines 44 and 5-5 of Figure 3.

Referring to the drawings in detail, and more particularly to Figure 2 thereof, my improved blank comprises a sheet of paper A of substantially sector-shape. In fact, in the embodiment shown, the blank is illustrated as being approximately half of a circle. It has a curved or arcuate edge a and one of the radial edges 0 is preferably a deckle or feather edge such as is usually provided to form the outside joint or seam of the cone. In order to prevent an excessive amount of material at the apex of the cone, I preferably cut away the extreme central portion of the blank, as indicated at (Z, and from this point outward.- extends asubstantially radial edge or tongue e. This edge or tongue does not, however, extend to the outer edge or periphery of the blank, but terminates at a notch 7. Between this notch and the arcuate edge or periphery of the blank is disposed a laterally projecting portion or flap B having a relatively short free end 5 which is preferably radial, and which is thinned so as to provide a deckle or feather edge. In practice, the deckle edge 6 lies in the same straight line and forms a continuation of the deckle edge 0. Thus my improved blank can be cut from a continuous sheet or web having one deckle edge, a portion of such edge being removed to form the tongue 6. It will be understood that the edge of the tongue 6 is not a deckle edge, but is of substantial thickness, and may be the same thickness as the body of the blank. y

In manufacturing cones from my improved blank, I employ a forming mandrel X, supported for rotation in any suitable way and. provided along its longitudinal surface with a slot or groove 1. This groove, however, preferably does not extend the full length of the cone, but terminates v at a point 2 spaced from the small end of the cone a distance substantially equal to the length of the tongue 6. p

In practice, the tongue 6 is inserted in the slot 1, as shown in Figure 1, by an endwise movement, until the end of the tongue adjacent the flap B abuts the end 2 of the slot. The portion or flap B beyond this point then occupies a position substantially tangent to the surface of the cone, as illustrated. It

will of course be understood that the blank has been coated with adhesive in the usual manner, before being placed upon the forming mandrel, and after the tongue e has been positioned in the slot, as shown, the flap B 18 smoothed or pasted down upon the surface of the conical mandrel by any suitablemeans, such for exam le, as that shown in my conding application, Serial No. 60,794, fil ed October 6, 1925. Thereupon, the mandrel is caused to rotate and, by means of the usual or any suitable mechanism, the paper blank is pressed against the side of the rotating mandrel and is thus wound about the same to form acone.

After being wound, the ends of the cone are trimmed by means of suitable cutters, one cutter operating past the small end of the mandrel and the other cutter operating in a circumferential oove 3 formed in the mandrel adjacent its arge end, both cutters operating in true transverse planes. The cutters may be of the ty shown in my copending application, S i 'ial No. 691,288, filed Feburay 7, 1924.

It will be observed that the groove 3 in which one of the cutters operates is located at such a point that the flap portion B of the blank overlies it. That is to say, the cutting of the blank takes place within the confines of the flap portion and at a point well beyond the end 2 of the slot 1, atwhich point a continuous unbroken surface of the mandrel is presented to the cutter so that the more. or less irre lar large end of the cone mfiay be complete y and eflectively trimmed 0 Figure 3 shows the appearance of a finished cone after being trimmed by the cutters in the manner described. By reference to this figure, itwill be seen that on the in side of the cone, extending from the small end longitudinally toward the base is a seam or joint formed by the edge of the tongue e but that this seam or joint does not extend entirely to the base of the cone. It terminates at. the notch f and the space between this notch and the lower or large end of the cone is occupied by the flap B with its thinned or deckle edge 0?.

- By reference to Figure 4, the edge of the tongue e can be clearly seen, and by reference to Figure 5, the position occupied by the deckle edge 6 will be equally clear. An examination of this last mentioned figure shows how this deckle edge Z) of the flap portion B clings to the interior wall of the cone and merges into it, so as to produce a joint which is practically undiscernible or invisof touch. In other words, the interior of the cone at this point presents a substantially smooth unbroken continuous surface throughout its circumference.

In the common type of winding machines on which cones of this character are employed, the driving dog or spindle on which the cone is supported is so constructed as to fit snugly within the large end of the cone. Owing to the smooth interior surface of my improved cones, it fits such dog or spindle perfectly, and is accurately centered thereon so that, even'when running at high speeds, it is remarkably free from vibration or any unevenness of operation.

As the holding dog or chuck referred to extends only a comparatively short distance into the large end of the cone, the fact that there is a seam or joint formed by the edge e of the tongue of normal thickness is immaterial. By the use of this tongue, however, I am enabled to secure] position the blank on the forming mandre as above described, in a simple and effective manner,

struction. I am enabled to produce substantially perfect cones in commercial quantities and with a very small percentage of defective cones.

\Vhat I claim is 1. A paper cone having on the inside the usual longitudinal joint extending from the small end toward the large end, but terminating short thereof, the interior surface beyond said joint and adjacent the large end being substantially smooth throughout its circumference, and unbroken by any discernable joint.

2. A cone formed from a rolled paper blank, such cone having a seam or joint on its inside, that portion of said seam or joint adjacent the large end being laterally oifset from the other port-ion, and being substantially invisible so as to provide an unbroken smooth surface, and that portion of the seam or joint adjacent the small end comprising an exposed edge of the blank of normal thickness.

3. A cone formed by rolling up a flat, substantially sector shaped paper blank having at one 0 its radial edges an inner portion of substantial thickness, and an outer portion having a deckle or feather edge.

4. A blank for making cones, consisting of a substantially sector shaped paper sheet having one of its radial edges cut to form a tongue of normal thickness, said tongue extending for only a part of the length of the radius from the apex of the sector, and a portion beyond said tongue having a deckle or feather edge.

5. A blank for making cones consisting of.

a substantially sector shaped paper sheet having atone endge a straight radial tongue, and between said tongue and the curved edge of the sector, a flap projecting laterally of said tongue, and formed with a deckle edge at its free end.

6. A blank for making cones consistin of a substantially sector shaped paper s eet having at one edge a straight radial tongue, and having the other radial edge deckled, said sheet also having, at a point between said tongue and the curved edge of the sector, a flap projecting laterally of said tongue, and formed with a deekle edge at its free end, said deckle edge of the flap lying in substantially the same straight line as the deckled radial edge of the sector;

In testimony whereof I afiix my signature.

PETER LE ROY MCCALL. 

